Hi, The POSIX functions you may want to try are open2 and open3. Much trouble come from the Unix buffering : as you can't force autoflushed output from the command, you'll simply have a deadlock 99% of the time. A solution (used in scsh, I think) is to send the stdout in a file and then to read the file. HTH jb John Meacham wrote:
I am trying to implement a function which takes a string, pipes it through an external command and returns the stdout of teh command utilizing the Posix library and ghc.
first of all, if someone has this handy code tidbit already written then feel free to send it to me. the other thing is that I cannot figure out how to get data into and out of the process. I can create a pipe which returns a pair of Fd's but then i cannot pass these into runProcess since it expects handles. also I have no ability to wait for the termination of the command that runProcess starts...
it is always possible i am just overlooking a few key functions in Posix...
John -- --------------------------------------------------------------------------- John Meacham - California Institute of Technology, Alum. - john@repetae.net ---------------------------------------------------------------------------
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Jean-Baptiste Robertson